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          <h1>Vert.x for RxGroovy</h1>
          
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    </div>
  </div>




<div id="content">
  <div class="container docs-content">
    <div class="row">
      <div class="col-sm-12 col-md-push-9 col-md-3 hidden-xs hidden-sm">
        <div id="sidebar" data-spy="affix">
          <ul class="sectlevel1">
<li><a href="#_read_stream_support">Read stream support</a></li>
<li><a href="#_handler_support">Handler support</a></li>
<li><a href="#_async_result_support">Async result support</a></li>
<li><a href="#_scheduler_support">Scheduler support</a></li>
<li><a href="#_json_unmarshalling">Json unmarshalling</a></li>
<li><a href="#_api_examples">Api examples</a>
<ul class="sectlevel2">
<li><a href="#_eventbus_message_stream">EventBus message stream</a></li>
<li><a href="#_timers">Timers</a></li>
<li><a href="#_http_client_requests">Http client requests</a></li>
<li><a href="#_http_server_requests">Http server requests</a></li>
<li><a href="#_websocket_client">Websocket client</a></li>
<li><a href="#_websocket_server">Websocket server</a></li>
</ul>
</li>
</ul>
        </div>
      </div>
      <div class="col-sm-12 col-md-pull-3 col-md-9">
        <div class="toc hidden-md hidden-lg">
          <h2>Table of Contents</h2>
          <ul class="sectlevel1">
<li><a href="#_read_stream_support">Read stream support</a></li>
<li><a href="#_handler_support">Handler support</a></li>
<li><a href="#_async_result_support">Async result support</a></li>
<li><a href="#_scheduler_support">Scheduler support</a></li>
<li><a href="#_json_unmarshalling">Json unmarshalling</a></li>
<li><a href="#_api_examples">Api examples</a>
<ul class="sectlevel2">
<li><a href="#_eventbus_message_stream">EventBus message stream</a></li>
<li><a href="#_timers">Timers</a></li>
<li><a href="#_http_client_requests">Http client requests</a></li>
<li><a href="#_http_server_requests">Http server requests</a></li>
<li><a href="#_websocket_client">Websocket client</a></li>
<li><a href="#_websocket_server">Websocket server</a></li>
</ul>
</li>
</ul>
        </div>
        <div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p><a href="https://github.com/ReactiveX/RxJava">RxJava</a> is a popular library for composing asynchronous and event
based programs using observable sequences for the Java VM. <a href="https://github.com/ReactiveX/RxGroovy">RxGroovy</a>
is the Reactive Extensions for Groovy. This adaptor allows <code>groovy.lang.Closure</code> functions to be used
and RxJava will know how to invoke them.</p>
</div>
<div class="paragraph">
<p>Vert.x integrates naturally with RxGroovy, allowing to use observable wherever you can use streams or asynchronous results.</p>
</div>
<div class="paragraph">
<p>To use vert.x API for RxGroovy, add the following dependency to the <em>dependencies</em> section of your build descriptor:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>Maven (in your <code>pom.xml</code>):</p>
</li>
</ul>
</div>
<div class="listingblock">
<div class="content">
<pre class="prettyprint highlight"><code class="language-xml" data-lang="xml">&lt;dependency&gt;
  &lt;groupId&gt;{maven-groupId}&lt;/groupId&gt;
  &lt;artifactId&gt;{maven-artifactId}&lt;/artifactId&gt;
  &lt;version&gt;{maven-version}&lt;/version&gt;
&lt;/dependency&gt;</code></pre>
</div>
</div>
<div class="ulist">
<ul>
<li>
<p>Gradle (in your <code>build.gradle</code> file):</p>
</li>
</ul>
</div>
<div class="listingblock">
<div class="content">
<pre class="prettyprint highlight"><code class="language-groovy" data-lang="groovy">compile {maven-groupId}:{maven-artifactId}:{maven-version}</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_read_stream_support">Read stream support</h2>
<div class="sectionbody">
<div class="paragraph">
<p>RxJava observable is a perfect match for Vert.x <code>ReadStream</code> class : both provide a flow of items.</p>
</div>
<div class="paragraph">
<p>Vert.x API for Groovy provides <code>io.vertx.groovy.core.stream.ReadStream</code> objects, the RxGroovy provides a
Groovy extension module that adds the <code>toObservable</code> method to the read stream class.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="prettyprint highlight"><code class="language-groovy" data-lang="groovy">def fs = vertx.fileSystem()
fs.open("/data.txt", [:], { result -&gt;
  def file = result.result()
  def observable = file.toObservable()
  observable.forEach({ data -&gt; println("Read data: ${data.toString("UTF-8")}") })
})</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_handler_support">Handler support</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The RxJava <code>io.vertx.ext.rx.java.RxHelper</code> should be used to:
- create an <code>io.vertx.ext.rx.java.ObservableHandler</code>,
- transform actions to an handler</p>
</div>
<div class="paragraph">
<p>The RxGroovy extension module adds the <code>toHandler</code> method on the <code>rx.Observer</code> class:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="prettyprint highlight"><code class="language-groovy" data-lang="groovy">Observer&lt;Long&gt; observer = Observers.create({ item -&gt; println("Timer fired!") })
Handler&lt;Long&gt; handler = observer.toHandler()
vertx.setTimer(1000, handler)</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_async_result_support">Async result support</h2>
<div class="sectionbody">
<div class="paragraph">
<p>In Vert.x future objects are modelled as async result handlers and occur as last parameter of asynchronous methods.</p>
</div>
<div class="paragraph">
<p>The RxGroovy extension module adds the <code>toFuture</code> method on the <code>rx.Observer</code> class:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="prettyprint highlight"><code class="language-groovy" data-lang="groovy">Observer&lt;HttpServer&gt; observer = Observers.create({ server -&gt; println("Server started") })
Handler&lt;AsyncResult&lt;HttpServer&gt;&gt; handler = observer.toFuture()
vertx.createHttpServer([port:1234,host:"localhost"]).listen(handler)</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_scheduler_support">Scheduler support</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The reactive extension sometimes needs to schedule actions, for instance <code>Observable#timer</code> create and returns
a timer that emit periodic events. By default, scheduled actions are managed by RxJava, it means that the
timer thread are not Vert.x threads and therefore not executing in a Vert.x event loop.</p>
</div>
<div class="paragraph">
<p>When an RxJava method deals with a scheduler, it accepts an overloaded method accepting an extra <code>Rx.Scheduler</code>,
the RxGroovy extension module adds to the <code>Vertx</code> class the <code>scheduler()</code> method will return a scheduler that can be used in such places.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="prettyprint highlight"><code class="language-groovy" data-lang="groovy">Observable&lt;Long&gt; timer = Observable.timer(100, 100, TimeUnit.MILLISECONDS, vertx.scheduler())</code></pre>
</div>
</div>
<div class="paragraph">
<p>For blocking scheduled actions, a scheduler can be created with the <code>blockingScheduler</code> method:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="prettyprint highlight"><code class="language-groovy" data-lang="groovy">Scheduler scheduler = vertx.blockingScheduler();
Observable&lt;Integer&gt; obs = blockingObservable.observeOn(scheduler);</code></pre>
</div>
</div>
<div class="paragraph">
<p>RxJava can also be configured to use a scheduler by default, the returned scheduler hook uses a blocking
scheduler for IO actions:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="prettyprint highlight"><code class="language-groovy" data-lang="groovy">RxJavaSchedulersHook hook = RxHelper.schedulerHook(vertx)
RxJavaPlugins.getInstance().registerSchedulersHook(hook)</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_json_unmarshalling">Json unmarshalling</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The <code>io.vertx.rx.groovy.RxHelper#unmarshaller(java.lang.Class)}</code> creates an <code>rx.Observable.Operator</code> that
transforms an <code>Observable&lt;Buffer&gt;</code> in json format into an object observable:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="prettyprint highlight"><code class="language-groovy" data-lang="groovy">def fileSystem = vertx.fileSystem()
fileSystem.open("/data.txt", [:], { result -&gt;
  AsyncFile file = result.result()
  Observable&lt;Buffer&gt; observable = file.toObservable()
  observable.lift(RxHelper.unmarshaller(MyPojo.class)).subscribe({ mypojo -&gt;
      // Process the object
  })
})</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_api_examples">Api examples</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Let&#8217;s study now a few examples of using Vert.x with RxJava.</p>
</div>
<div class="sect2">
<h3 id="_eventbus_message_stream">EventBus message stream</h3>
<div class="paragraph">
<p>The event bus <code>MessageConsumer</code> provides naturally an <code>Observable&lt;Message&lt;T&gt;&gt;</code>:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="prettyprint highlight"><code class="language-groovy" data-lang="groovy">EventBus eb = vertx.eventBus()
MessageConsumer&lt;String&gt; consumer = eb.&lt;String&gt;consumer("the-address")
Observable&lt;Message&lt;String&gt;&gt; observable = consumer.toObservable()
Subscription sub = observable.subscribe({ msg -&gt;
  // Got message
});

// Unregisters the stream after 10 seconds
vertx.setTimer(10000, { id -&gt;
  sub.unsubscribe()
});</code></pre>
</div>
</div>
<div class="paragraph">
<p>The <code>MessageConsumer</code> provides a stream of <code>Message</code>.
The <code>Message#body()</code> gives access to a new stream of message bodies if needed:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="prettyprint highlight"><code class="language-groovy" data-lang="groovy">EventBus eb = vertx.eventBus()
MessageConsumer&lt;String&gt; consumer = eb.&lt;String&gt;consumer("the-address")
Observable&lt;String&gt; observable = consumer.bodyStream().toObservable()</code></pre>
</div>
</div>
<div class="paragraph">
<p>RxJava map/reduce composition style can be then be used:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="prettyprint highlight"><code class="language-groovy" data-lang="groovy">Observable&lt;Double&gt; observable = vertx.eventBus().
&lt;Double&gt;consumer("heat-sensor").
    bodyStream().
    toObservable()

observable.
    buffer(1, TimeUnit.SECONDS).
    map({ samples -&gt; samples.sum() }).
    subscribe({ heat -&gt;
      vertx.eventBus().send("news-feed", "Current heat is " + heat)
    });</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_timers">Timers</h3>
<div class="paragraph">
<p>Timer task can be created with <code>Vertx#timerStream(long)</code>:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="prettyprint highlight"><code class="language-groovy" data-lang="groovy">vertx.timerStream(1000).
    toObservable().
    subscribe({ id -&gt;
          println("Callback after 1 second")
        }
    )</code></pre>
</div>
</div>
<div class="paragraph">
<p>Periodic task can be created with <code>Vertx#periodicStream(long)</code>:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="prettyprint highlight"><code class="language-groovy" data-lang="groovy">vertx.periodicStream(1000).
    toObservable().
    subscribe({ id -&gt;
          println("Callback every second")
        }
    )</code></pre>
</div>
</div>
<div class="paragraph">
<p>The observable can be cancelled with an unsubscription:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="prettyprint highlight"><code class="language-groovy" data-lang="groovy">vertx.periodicStream(1000).
    toObservable().
    subscribe(new Subscriber&lt;Long&gt;() {
      public void onNext(Long aLong) {
        // Callback
        unsubscribe()
      }
      public void onError(Throwable e) {}
      public void onCompleted() {}
    })</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_http_client_requests">Http client requests</h3>
<div class="paragraph">
<p><code>HttpClientRequest#toObservable()</code> provides a one shot callback with the <code>HttpClientResponse</code>}
 object. The observable reports a request failure.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="prettyprint highlight"><code class="language-groovy" data-lang="groovy">HttpClientRequest request = client.request(HttpMethod.GET, 8080, "localhost", "/the_uri")
request.toObservable().subscribe({ response -&gt;
  // Process the response
}, { error -&gt;
  // Could not connect
})
request.end()</code></pre>
</div>
</div>
<div class="literalblock">
<div class="content">
<pre> The response can be processed as an `Observable&lt;Buffer&gt;` with the
`HttpClientResponse#toObservable()` method:</pre>
</div>
</div>
<div class="listingblock">
<div class="content">
<pre class="prettyprint highlight"><code class="language-groovy" data-lang="groovy">HttpClientRequest request = client.request(HttpMethod.GET, 8080, "localhost", "/the_uri")
request.toObservable().
    subscribe(
        { response -&gt;
          Observable&lt;Buffer&gt; observable = response.toObservable()
          observable.forEach(
              { buffer -&gt;
                // Process buffer
              })
        })</code></pre>
</div>
</div>
<div class="paragraph">
<p>The same flow can be achieved with the <code>flatMap</code> operation:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="prettyprint highlight"><code class="language-groovy" data-lang="groovy">request.toObservable().
    flatMap({resp -&gt; resp.&amp;toObservable}).
    forEach(
        { buffer -&gt;
      // Process buffer
    })</code></pre>
</div>
</div>
<div class="paragraph">
<p>We can also unmarshall the <code>Observable&lt;Buffer&gt;</code> into an object using the {@link io.vertx.rx.groovy.RxHelpe.RxHelper#unmarshaller(java.lang.Class)}
static method. This method creates an <code>Rx.Observable.Operator</code> unmarshalling buffers to an object:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="prettyprint highlight"><code class="language-groovy" data-lang="groovy">request.toObservable().
    flatMap({ resp -&gt; resp.&amp;toObservable }).
    lift(RxHelper.unmarshaller(MyPojo.class)).
    forEach({ pojo -&gt;
      // Process pojo
    })</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_http_server_requests">Http server requests</h3>
<div class="paragraph">
<p>The <code>HttpServer#requestStream()</code> provides a callback for each incoming request:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="prettyprint highlight"><code class="language-groovy" data-lang="groovy">Observable&lt;HttpServerRequest&gt; requestObservable = server.requestStream().toObservable()
requestObservable.subscribe({ request -&gt;
  // Process request
})</code></pre>
</div>
</div>
<div class="paragraph">
<p>The <code>HttpServerRequest</code> can then be adapted to an <code>Observable&lt;Buffer&gt;</code>:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="prettyprint highlight"><code class="language-groovy" data-lang="groovy">Observable&lt;HttpServerRequest&gt; requestObservable = server.requestStream().toObservable()
requestObservable.subscribe({ request -&gt;
  Observable&lt;Buffer&gt; observable = request.toObservable()
});</code></pre>
</div>
</div>
<div class="paragraph">
<p>The <code>io.vertx.rx.groovy.RxHelpe.RxHelper#unmarshaller(java.lang.Class)}</code> can be used to parse and map a json request to an object:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="prettyprint highlight"><code class="language-groovy" data-lang="groovy">Observable&lt;HttpServerRequest&gt; requestObservable = server.requestStream().toObservable()
requestObservable.subscribe({ request -&gt;
  Observable&lt;MyPojo&gt; observable = request.
      toObservable().
      lift(RxHelper.unmarshaller(MyPojo.class))
})</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_websocket_client">Websocket client</h3>
<div class="paragraph">
<p>The`HttpClient#websocketStream`} provides a single callback when the websocket connects, otherwise a failure:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="prettyprint highlight"><code class="language-groovy" data-lang="groovy">HttpClient client = vertx.createHttpClient()
WebSocketStream stream = client.websocketStream(8080, "localhost", "/the_uri")
Observable&lt;WebSocket&gt; socketObservable = stream.toObservable()
socketObservable.subscribe(
    { ws -&gt;
      // Use the websocket
    }, { error -&gt;
  // Could not connect
})</code></pre>
</div>
</div>
<div class="paragraph">
<p>The <code>WebSocket</code> can then be turned into an <code>Observable&lt;Buffer&gt;</code> easily</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="prettyprint highlight"><code class="language-groovy" data-lang="groovy">socketObservable.subscribe(
    { socket -&gt;
      Observable&lt;Buffer&gt; dataObs = socket.toObservable()
      dataObs.subscribe({ buffer -&gt;
        println("Got message ${buffer.toString("UTF-8")}")
      })
    })</code></pre>
</div>
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</div>
<div class="sect2">
<h3 id="_websocket_server">Websocket server</h3>
<div class="paragraph">
<p>The <code>HttpServer#websocketStream()</code> provides a callback for each incoming connection:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="prettyprint highlight"><code class="language-groovy" data-lang="groovy">Observable&lt;ServerWebSocket&gt; socketObservable = server.websocketStream().toObservable()
socketObservable.subscribe(
    { socket -&gt; println("Web socket connect") },
    { failure -&gt; println("Should never be called") },
    { println("Subscription ended or server closed") }
)</code></pre>
</div>
</div>
<div class="paragraph">
<p>The <code>ServerWebSocket</code> can be turned into an <code>Observable&lt;Buffer&gt;</code> easily:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="prettyprint highlight"><code class="language-groovy" data-lang="groovy">Observable&lt;ServerWebSocket&gt; socketObservable = server.websocketStream().toObservable()
socketObservable.subscribe({ socket -&gt;
  Observable&lt;Buffer&gt; dataObs = socket.toObservable()
  dataObs.subscribe({ buffer -&gt;
    println("Got message ${buffer.toString("UTF-8")}")
  })
})</code></pre>
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